Ultra-thin double Janus nanofiltration membrane for separation of Li+ and Mg2+: “Drag” effect from carboxyl-containing negative interlayer

Guo, Changsheng; Li, Nan; Qian, Xiaoming; Shi, Jie; Jing, Miaolei; Teng, Kunyue; Xu, Zhiwei

doi:10.1016/j.seppur.2019.05.009

Cited by 154 publications

(40 citation statements)

References 64 publications

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“…XPS analysis was used to assess crosslinking degree of PA selective layer by analyze elements and chemical bonds at the top of membranes [38] . Figure S4 exhibited the XPS spectra of membranes, including three peaks at 532, 399 and 285 eV, which associated with O1s, N1 and C1s peak, respectively [39] .…”

Section: Resultsmentioning

confidence: 99%

Decorating a Loose Defect‐free Hybrid Selective Layer on a Smooth Intermediary: An Effective Way for Unexpected Performances of Nanofiber‐based Forward Osmosis Membranes

Han

et al. 2020

ChemNanoMat

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A novel composite forward osmosis (FO) membrane was fabricated by introducing a chitosan (CS) sublayer between nanofibers and polyamide (PA) layer, which was beneficial to forming thin and defect‐free PA layer and improved binding strength between substrate and the selective layer. Results exhibited low reverse salt flux (0.73 gMH) while maintained high water flux (85.4 LMH), which were better than that in other reports. In order to further improve permeability of membranes, oxidized multiwall carbon nanotubes (OMWNTs) were added into PA layer based on the optimized sublayer. The crosslinking degree of PA layer was reduced, leading to loose PA layers, which promoted the increase of water flux. After modifying, water flux reached 96.9 LMH without sacrificing salt rejection. It was worth mentioning that PAN/CS composite FO membrane, which could adjust microstructure of support layer and selective layer respectively, may provide a promising way for preparing membranes with anticipated separation performance.

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Section: Resultsmentioning

confidence: 99%

Decorating a Loose Defect‐free Hybrid Selective Layer on a Smooth Intermediary: An Effective Way for Unexpected Performances of Nanofiber‐based Forward Osmosis Membranes

Han

et al. 2020

ChemNanoMat

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“…reached up to 76%, and the permeation flux was * 5.02 L/(m 2 hbar). Figure 15f shows another preparation process for a novel double-Janus composite NF membrane [208]. The middle layer of the composite membrane exhibited negative chargeability and the J Mater Sci (2021) 56:16-63 surface layer showed opposite chargeability, which is helpful for rejecting Mg 2?…”

Section: Nanofiltration Membrane Techniquementioning

confidence: 99%

“…range in brine is 5-90. Enhancing the applied voltage can effectively improve the separation efficiency and recovery rate Figure 15 Preparation schematic diagram of a DAPP/TMC hollow positively charged NF membrane [206]; b PEI/TMC high positively charged NF membrane [201]; c M-CNTs grafted PIP/TMC hollow NF membrane [209]; d polyhydroxylated doped PIP/TMC NF membrane [207]; e BPEI/TMC positively charged NF membrane [25]; and f double-Janus composite NF membrane [208]. [216].…”

Section: Electrodialysis Technologymentioning

confidence: 99%

Materials for lithium recovery from salt lake brine

et al. 2020

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Rapid developments in the electric industry have promoted an increasing demand for lithium resources. Lithium in salt lake brines has emerged as the main source for industrial lithium extraction, owing to its low cost and extensive reserves. The effective separation of Mg 2? and Li ? is critical to achieving high recovery efficiency and purity of the final lithium product. This paper summarizes Mg 2? /Li ? separation materials and methods in the field of lithium recovery from salt lake brines. The review begins with an introduction to the global distribution and demand for lithium resources, followed by a description of the materials used in various separation techniques, including precipitation, adsorption, solvent extraction, nanofiltration membrane, electrodialysis, and electrochemical methods. A comparison, analysis, and outlook of such methods are comprehensively discussed in terms of principles, mechanisms, synthesis/operation, development, and industrial applications. We conclude with a presentation of challenges and insights into the future directions of lithium extraction from salt lake brines. A combination of the advantages of various materials is the most logical step toward developing novel methods for extracting lithium from brines with high separation selectivity, stability, low cost, and environmentally friendly characteristics.

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“…The water permeability of CSH/CNF paper with 82.5 wt% CSH is signicantly higher than that of nanoltration membranes. [26][27][28][29][30] Further detailed comparison is presented in Section 3.3. The low water ux of CSH/CNF paper with relatively low CSH weight ratio may due to the low porosity and dense structure.…”

Section: Characterization Of Csh/cnf Nanocomposite Papermentioning

confidence: 99%

“…Even though the electrospun nanober membranes have achieved great progresses in water treatment elds, some problems still hinder their applications, 25 such as specic preparation equipment, high voltage, and organic solvents. The graphene-nanomesh/single-walled carbon nanotube membrane 26 polyamide membrane, 27 graphene oxide/polyamide membrane, 28 graphene oxide/oxidized carbon nanotubes/polyethersulfone membrane, 29 and carboxylated cellulose nanocrystal/polyamide/ polyethersulfone membrane 30 showed fast separation and high water transportation performances. These nanoltration membranes need elaborate design and complicated preparation processes.…”

Section: Introductionmentioning

confidence: 99%

A nanocomposite paper comprising calcium silicate hydrate nanosheets and cellulose nanofibers for high-performance water purification

Zhang

et al. 2020

RSC Adv.

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Ultra-thin double Janus nanofiltration membrane for separation of Li+ and Mg2+: “Drag” effect from carboxyl-containing negative interlayer

Cited by 154 publications

References 64 publications

Decorating a Loose Defect‐free Hybrid Selective Layer on a Smooth Intermediary: An Effective Way for Unexpected Performances of Nanofiber‐based Forward Osmosis Membranes

Decorating a Loose Defect‐free Hybrid Selective Layer on a Smooth Intermediary: An Effective Way for Unexpected Performances of Nanofiber‐based Forward Osmosis Membranes

Materials for lithium recovery from salt lake brine

A nanocomposite paper comprising calcium silicate hydrate nanosheets and cellulose nanofibers for high-performance water purification

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